BSD 3 development

Work on file usr/src/cmd/passwd.c

Synthesized-from: 3bsd

diff --git a/usr/src/cmd/passwd.c b/usr/src/cmd/passwd.c
new file mode 100644 (file)
index 0000000..a19a09f
--- /dev/null
+++ b/usr/src/cmd/passwd.c
@@ -0,0 +1,172 @@
+/*
+ * enter a password in the password file
+ * this program should be suid with owner
+ * with an owner with write permission on /etc/passwd
+ */
+#include <stdio.h>
+#include <signal.h>
+#include <pwd.h>
+
+char   passwd[] = "/etc/passwd";
+char   temp[]   = "/etc/ptmp";
+struct passwd *pwd;
+struct passwd *getpwent();
+int    endpwent();
+char   *strcpy();
+char   *crypt();
+char   *getpass();
+char   *getlogin();
+char   *pw;
+char   pwbuf[10];
+char   buf[BUFSIZ];
+
+main(argc, argv)
+char *argv[];
+{
+       char *p;
+       int i;
+       char saltc[2];
+       long salt;
+       int u,fi,fo;
+       int insist;
+       int ok, flags;
+       int c;
+       int pwlen;
+       FILE *tf;
+       char *uname;
+
+       insist = 0;
+       if(argc < 2) {
+               if ((uname = getlogin()) == NULL) {
+                       printf ("Usage: passwd user\n");
+                       goto bex;
+               } else {
+                       printf("Changing password for %s\n", uname);
+               }
+       } else {
+               uname = argv[1];
+       }
+       while(((pwd=getpwent()) != NULL)&&(strcmp(pwd->pw_name,uname)!=0));
+       u = getuid();
+       if((pwd==NULL) || (u!=0 && u != pwd->pw_uid))
+               {
+               printf("Permission denied.\n");
+               goto bex;
+               }
+       endpwent();
+       if (pwd->pw_passwd[0] && u != 0) {
+               strcpy(pwbuf, getpass("Old password:"));
+               pw = crypt(pwbuf, pwd->pw_passwd);
+               if(strcmp(pw, pwd->pw_passwd) != 0) {
+                       printf("Sorry.\n");
+                       goto bex;
+               }
+       }
+tryagn:
+       strcpy(pwbuf, getpass("New password:"));
+       pwlen = strlen(pwbuf);
+       if (pwlen == 0) {
+               printf("Password unchanged.\n");
+               goto bex;
+       }
+       ok = 0;
+       flags = 0;
+       p = pwbuf;
+       while(c = *p++){
+               if(c>='a' && c<='z') flags |= 2;
+               else if(c>='A' && c<='Z') flags |= 4;
+               else if(c>='0' && c<='9') flags |= 1;
+               else flags |= 8;
+       }
+       if(flags >=7 && pwlen>= 4) ok = 1;
+       if(((flags==2)||(flags==4)) && pwlen>=6) ok = 1;
+       if(((flags==3)||(flags==5)||(flags==6))&&pwlen>=5) ok = 1;
+
+       if((ok==0) && (insist<2)){
+               if(flags==1)
+               printf("Please use at least one non-numeric character.\n");
+               else
+               printf("Please use a longer password.\n");
+               insist++;
+               goto tryagn;
+               }
+
+       if (strcmp(pwbuf,getpass("Retype new password:")) != 0) {
+               printf ("Mismatch - password unchanged.\n");
+               goto bex;
+       }
+
+       time(&salt);
+       salt += getpid();
+
+       saltc[0] = salt & 077;
+       saltc[1] = (salt>>6) & 077;
+       for(i=0;i<2;i++){
+               c = saltc[i] + '.';
+               if(c>'9') c += 7;
+               if(c>'Z') c += 6;
+               saltc[i] = c;
+       }
+       pw = crypt(pwbuf, saltc);
+       signal(SIGHUP, SIG_IGN);
+       signal(SIGINT, SIG_IGN);
+       signal(SIGQUIT, SIG_IGN);
+
+       if(access(temp, 0) >= 0) {
+               printf("Temporary file busy -- try again\n");
+               goto bex;
+       }
+       close(creat(temp,0600));
+       if((tf=fopen(temp,"w")) == NULL) {
+               printf("Cannot create temporary file\n");
+               goto bex;
+       }
+
+/*
+ *     copy passwd to temp, replacing matching lines
+ *     with new password.
+ */
+
+       while((pwd=getpwent()) != NULL) {
+               if(strcmp(pwd->pw_name,uname) == 0) {
+                       u = getuid();
+                       if(u != 0 && u != pwd->pw_uid) {
+                               printf("Permission denied.\n");
+                               goto out;
+                       }
+                       pwd->pw_passwd = pw;
+                       if (pwd->pw_gecos[0] == '*')
+                               pwd->pw_gecos++;
+               }
+               fprintf(tf,"%s:%s:%d:%d:%s:%s:%s\n",
+                       pwd->pw_name,
+                       pwd->pw_passwd,
+                       pwd->pw_uid,
+                       pwd->pw_gid,
+                       pwd->pw_gecos,
+                       pwd->pw_dir,
+                       pwd->pw_shell);
+       }
+       endpwent();
+       fclose(tf);
+
+/*
+ *     copy temp back to passwd file
+ */
+
+       if((fi=open(temp,0)) < 0) {
+               printf("Temp file disappeared!\n");
+               goto out;
+       }
+       if((fo=creat(passwd, 0644)) < 0) {
+               printf("Cannot recreat passwd file.\n");
+               goto out;
+       }
+       while((u=read(fi,buf,sizeof(buf))) > 0) write(fo,buf,u);
+
+out:
+       unlink(temp);
+
+bex:
+       exit(1);
+}